Finding the Fourth Proportional to 1,605.96, 2,216.24 and 897.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.96 : 2,216.24 = 897.86 : x
2. Step 2: Convert to fraction form
   1,605.96/2,216.24 = 897.86/x
3. Step 3: Cross multiply
   1,605.96x = 2,216.24 × 897.86
4. Step 4: Simplify right side
   1,605.96x = 1,989,873.25
5. Step 5: Solve for x
   x = 1,989,873.25/1,605.96
6. Step 6: Final answer
   x = 1,239.06